CA1311093C - Procede pour la delignification de matieres cellulosiques - Google Patents

Procede pour la delignification de matieres cellulosiques

Info

Publication number: CA1311093C
Authority: CA; Canada
Prior art keywords: cellulosic materials; materials; cooking; carried out; stage
Prior art date: 1985-08-05
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Lifetime

Application number

CA000515193A

Other languages

English (en)

French (fr)

Inventor

Josef S. Gratzl

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Solvay Chimie SA

Original Assignee

Interox SA

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1985-08-05

Filing date

1986-08-01

Publication date

1992-12-08

1986-08-01 Application filed by Interox SA filed Critical Interox SA

1992-12-08 Application granted granted Critical

1992-12-08 Publication of CA1311093C publication Critical patent/CA1311093C/fr

2009-12-08 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 43
239000000463 material Substances 0.000 claims abstract description 45
MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 39
238000010411 cooking Methods 0.000 claims abstract description 25
239000002253 acid Substances 0.000 claims abstract description 16
239000002023 wood Substances 0.000 claims abstract description 15
239000003153 chemical reaction reagent Substances 0.000 claims abstract description 13
229910052751 metal Inorganic materials 0.000 claims abstract description 3
239000002184 metal Substances 0.000 claims abstract description 3
150000002739 metals Chemical class 0.000 claims abstract description 3
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 14
150000002978 peroxides Chemical class 0.000 claims description 10
239000007864 aqueous solution Substances 0.000 claims description 8
UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 claims description 5
150000004056 anthraquinones Chemical class 0.000 claims description 5
239000001257 hydrogen Substances 0.000 claims description 5
229910052739 hydrogen Inorganic materials 0.000 claims description 5
229910021645 metal ion Inorganic materials 0.000 claims description 3
239000011122 softwood Substances 0.000 claims description 3
239000008139 complexing agent Substances 0.000 claims description 2
150000001875 compounds Chemical class 0.000 claims description 2
150000008044 alkali metal hydroxides Chemical class 0.000 claims 1
239000003513 alkali Substances 0.000 abstract description 5
239000012634 fragment Substances 0.000 abstract description 3
150000004679 hydroxides Chemical class 0.000 abstract description 3
229920002678 cellulose Polymers 0.000 abstract description 2
239000001913 cellulose Substances 0.000 abstract description 2
238000012360 testing method Methods 0.000 description 13
239000000654 additive Substances 0.000 description 7
239000000126 substance Substances 0.000 description 7
229910052784 alkaline earth metal Inorganic materials 0.000 description 6
-1 peroxide compound Chemical class 0.000 description 6
239000000243 solution Substances 0.000 description 6
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
241000196324 Embryophyta Species 0.000 description 4
150000007513 acids Chemical class 0.000 description 4
238000010438 heat treatment Methods 0.000 description 4
238000005470 impregnation Methods 0.000 description 4
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
229910052783 alkali metal Inorganic materials 0.000 description 3
150000001342 alkaline earth metals Chemical class 0.000 description 3
229940077731 carbohydrate nutrients Drugs 0.000 description 3
235000014633 carbohydrates Nutrition 0.000 description 3
150000001720 carbohydrates Chemical class 0.000 description 3
238000006243 chemical reaction Methods 0.000 description 3
229920005610 lignin Polymers 0.000 description 3
150000007522 mineralic acids Chemical class 0.000 description 3
239000000123 paper Substances 0.000 description 3
235000015927 pasta Nutrition 0.000 description 3
239000000523 sample Substances 0.000 description 3
238000005406 washing Methods 0.000 description 3
APLQXUAECQNQFE-UHFFFAOYSA-N 2-methoxyanthracene-9,10-dione Chemical compound C1=CC=C2C(=O)C3=CC(OC)=CC=C3C(=O)C2=C1 APLQXUAECQNQFE-UHFFFAOYSA-N 0.000 description 2
NJWGQARXZDRHCD-UHFFFAOYSA-N 2-methylanthraquinone Chemical compound C1=CC=C2C(=O)C3=CC(C)=CC=C3C(=O)C2=C1 NJWGQARXZDRHCD-UHFFFAOYSA-N 0.000 description 2
QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
229920001131 Pulp (paper) Polymers 0.000 description 2
CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
150000001340 alkali metals Chemical class 0.000 description 2
239000011575 calcium Substances 0.000 description 2
229910052791 calcium Inorganic materials 0.000 description 2
239000003795 chemical substances by application Substances 0.000 description 2
150000002500 ions Chemical class 0.000 description 2
239000000203 mixture Substances 0.000 description 2
LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 2
229910052700 potassium Inorganic materials 0.000 description 2
239000011591 potassium Substances 0.000 description 2
WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 description 2
GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
238000002791 soaking Methods 0.000 description 2
XPCZSIPRUSOJFO-UHFFFAOYSA-N 1,4,4a,9a-tetrahydroanthracene-9,10-dione Chemical compound O=C1C2=CC=CC=C2C(=O)C2C1CC=CC2 XPCZSIPRUSOJFO-UHFFFAOYSA-N 0.000 description 1
150000005208 1,4-dihydroxybenzenes Chemical class 0.000 description 1
JBDYKGMNMDIHFL-UHFFFAOYSA-N 1-nitroanthracene Chemical compound C1=CC=C2C=C3C([N+](=O)[O-])=CC=CC3=CC2=C1 JBDYKGMNMDIHFL-UHFFFAOYSA-N 0.000 description 1
KIJPZYXCIHZVGP-UHFFFAOYSA-N 2,3-dimethylanthracene-9,10-dione Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C=C(C)C(C)=C2 KIJPZYXCIHZVGP-UHFFFAOYSA-N 0.000 description 1
RATJDSXPVPAWJJ-UHFFFAOYSA-N 2,7-dimethylanthracene-9,10-dione Chemical compound C1=C(C)C=C2C(=O)C3=CC(C)=CC=C3C(=O)C2=C1 RATJDSXPVPAWJJ-UHFFFAOYSA-N 0.000 description 1
HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
SJEBAWHUJDUKQK-UHFFFAOYSA-N 2-ethylanthraquinone Chemical compound C1=CC=C2C(=O)C3=CC(CC)=CC=C3C(=O)C2=C1 SJEBAWHUJDUKQK-UHFFFAOYSA-N 0.000 description 1
YYVYAPXYZVYDHN-UHFFFAOYSA-N 9,10-phenanthroquinone Chemical compound C1=CC=C2C(=O)C(=O)C3=CC=CC=C3C2=C1 YYVYAPXYZVYDHN-UHFFFAOYSA-N 0.000 description 1
IJHINNYNYMRJDP-UHFFFAOYSA-N 9-chloro-10-nitro-9,10-dihydroanthracene Chemical compound C1=CC=C2C([N+](=O)[O-])C3=CC=CC=C3C(Cl)C2=C1 IJHINNYNYMRJDP-UHFFFAOYSA-N 0.000 description 1
QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 1
241000609240 Ambelania acida Species 0.000 description 1
235000017166 Bambusa arundinacea Nutrition 0.000 description 1
235000017491 Bambusa tulda Nutrition 0.000 description 1
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 1
DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
235000014676 Phragmites communis Nutrition 0.000 description 1
244000273256 Phragmites communis Species 0.000 description 1
244000082204 Phyllostachys viridis Species 0.000 description 1
235000015334 Phyllostachys viridis Nutrition 0.000 description 1
235000008566 Pinus taeda Nutrition 0.000 description 1
241000218679 Pinus taeda Species 0.000 description 1
WTKZEGDFNFYCGP-UHFFFAOYSA-N Pyrazole Chemical compound C=1C=NNC=1 WTKZEGDFNFYCGP-UHFFFAOYSA-N 0.000 description 1
240000000111 Saccharum officinarum Species 0.000 description 1
235000007201 Saccharum officinarum Nutrition 0.000 description 1
239000004115 Sodium Silicate Substances 0.000 description 1
230000003213 activating effect Effects 0.000 description 1
230000000996 additive effect Effects 0.000 description 1
150000001298 alcohols Chemical class 0.000 description 1
150000001412 amines Chemical class 0.000 description 1
150000001413 amino acids Chemical class 0.000 description 1
229910021529 ammonia Inorganic materials 0.000 description 1
150000001454 anthracenes Chemical class 0.000 description 1
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
239000010905 bagasse Substances 0.000 description 1
239000011425 bamboo Substances 0.000 description 1
AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
239000000920 calcium hydroxide Substances 0.000 description 1
229910001861 calcium hydroxide Inorganic materials 0.000 description 1
235000019402 calcium peroxide Nutrition 0.000 description 1
150000004649 carbonic acid derivatives Chemical class 0.000 description 1
230000001413 cellular effect Effects 0.000 description 1
235000013339 cereals Nutrition 0.000 description 1
238000007796 conventional method Methods 0.000 description 1
238000005260 corrosion Methods 0.000 description 1
238000000354 decomposition reaction Methods 0.000 description 1
238000013461 design Methods 0.000 description 1
230000000694 effects Effects 0.000 description 1
239000003344 environmental pollutant Substances 0.000 description 1
238000000605 extraction Methods 0.000 description 1
239000011521 glass Substances 0.000 description 1
239000011121 hardwood Substances 0.000 description 1
239000003112 inhibitor Substances 0.000 description 1
150000002484 inorganic compounds Chemical class 0.000 description 1
229910001853 inorganic hydroxide Inorganic materials 0.000 description 1
229910010272 inorganic material Inorganic materials 0.000 description 1
239000002655 kraft paper Substances 0.000 description 1
239000012978 lignocellulosic material Substances 0.000 description 1
239000007788 liquid Substances 0.000 description 1
229910001425 magnesium ion Inorganic materials 0.000 description 1
159000000003 magnesium salts Chemical class 0.000 description 1
238000004519 manufacturing process Methods 0.000 description 1
MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
150000002894 organic compounds Chemical class 0.000 description 1
230000003647 oxidation Effects 0.000 description 1
238000007254 oxidation reaction Methods 0.000 description 1
239000001301 oxygen Substances 0.000 description 1
229910052760 oxygen Inorganic materials 0.000 description 1
229960003330 pentetic acid Drugs 0.000 description 1
238000005325 percolation Methods 0.000 description 1
150000003009 phosphonic acids Chemical class 0.000 description 1
231100000719 pollutant Toxicity 0.000 description 1
125000003367 polycyclic group Chemical group 0.000 description 1
238000002360 preparation method Methods 0.000 description 1
238000004321 preservation Methods 0.000 description 1
238000002203 pretreatment Methods 0.000 description 1
239000000047 product Substances 0.000 description 1
238000004537 pulping Methods 0.000 description 1
229940079877 pyrogallol Drugs 0.000 description 1
239000002994 raw material Substances 0.000 description 1
230000035484 reaction time Effects 0.000 description 1
239000003352 sequestering agent Substances 0.000 description 1
238000004904 shortening Methods 0.000 description 1
NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
229910052911 sodium silicate Inorganic materials 0.000 description 1
239000002195 soluble material Substances 0.000 description 1
239000003381 stabilizer Substances 0.000 description 1
229910001220 stainless steel Inorganic materials 0.000 description 1
239000010935 stainless steel Substances 0.000 description 1
238000010561 standard procedure Methods 0.000 description 1
239000010902 straw Substances 0.000 description 1
235000011149 sulphuric acid Nutrition 0.000 description 1
239000013589 supplement Substances 0.000 description 1
239000004094 surface-active agent Substances 0.000 description 1
230000002195 synergetic effect Effects 0.000 description 1
239000002699 waste material Substances 0.000 description 1
238000009941 weaving Methods 0.000 description 1
238000005303 weighing Methods 0.000 description 1
239000000080 wetting agent Substances 0.000 description 1

Classifications

- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/26—Multistage processes

Landscapes

Polysaccharides And Polysaccharide Derivatives (AREA)
Paper (AREA)
Detergent Compositions (AREA)
Diaphragms For Electromechanical Transducers (AREA)
Compositions Of Macromolecular Compounds (AREA)
Dental Preparations (AREA)
Materials For Medical Uses (AREA)
Chemical Or Physical Treatment Of Fibers (AREA)
External Artificial Organs (AREA)
Ultra Sonic Daignosis Equipment (AREA)
Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Agricultural Chemicals And Associated Chemicals (AREA)

CA000515193A 1985-08-05 1986-08-01 Procede pour la delignification de matieres cellulosiques Expired - Lifetime CA1311093C (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
US76272685A	1985-08-05	1985-08-05
US762,726		1985-08-05

Publications (1)

Publication Number	Publication Date
CA1311093C true CA1311093C (fr)	1992-12-08

Family

ID=25065883

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA000515193A Expired - Lifetime CA1311093C (fr)	1985-08-05	1986-08-01	Procede pour la delignification de matieres cellulosiques

Country Status (13)

Country	Link
EP (1)	EP0212329B1 (de)
JP (1)	JPH0742670B2 (de)
AT (1)	ATE57400T1 (de)
AU (1)	AU591509B2 (de)
BR (1)	BR8603672A (de)
CA (1)	CA1311093C (de)
DE (1)	DE3674859D1 (de)
ES (1)	ES2000385A6 (de)
FI (1)	FI85726C (de)
NO (1)	NO168490C (de)
NZ (1)	NZ217002A (de)
PT (1)	PT83118B (de)
YU (1)	YU45351B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
IN167959B (de) *	1985-08-05	1991-01-12	Interox

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR1474276A (fr) *	1965-03-19	1967-03-24	Electro Chimie Soc D	Perfectionnements à la fabrication de pâte à papier
SE373896B (de) *	1972-07-05	1975-02-17	Mo Och Domsjoe Ab
SE380298B (sv) *	1974-03-14	1975-11-03	Mo	Forfarande for delignifiering genom syrgas-alkalibehandling av lignocelluosahaltigt material
SE7612248L (sv) *	1976-11-03	1978-05-04	Mo Och Domsjoe Ab	Kokning av lignocellulosahaltiga material
SU821614A1 (ru) *	1979-06-19	1981-04-15	Белорусский Технологический Институт Им.C.M.Кирова	Способ получени целлюлозного полу-фАбРиКАТА
IN167959B (de) *	1985-08-05	1991-01-12	Interox

1986
- 1986-07-25 AU AU60544/86A patent/AU591509B2/en not_active Ceased
- 1986-07-25 EP EP86110248A patent/EP0212329B1/de not_active Expired - Lifetime
- 1986-07-25 AT AT86110248T patent/ATE57400T1/de not_active IP Right Cessation
- 1986-07-25 DE DE8686110248T patent/DE3674859D1/de not_active Expired - Fee Related
- 1986-07-28 NZ NZ217002A patent/NZ217002A/xx unknown
- 1986-07-31 YU YU1369/86A patent/YU45351B/xx unknown
- 1986-08-01 PT PT83118A patent/PT83118B/pt not_active IP Right Cessation
- 1986-08-01 CA CA000515193A patent/CA1311093C/fr not_active Expired - Lifetime
- 1986-08-04 ES ES8600840A patent/ES2000385A6/es not_active Expired
- 1986-08-04 JP JP61183262A patent/JPH0742670B2/ja not_active Expired - Lifetime
- 1986-08-04 NO NO863133A patent/NO168490C/no not_active IP Right Cessation
- 1986-08-04 BR BR8603672A patent/BR8603672A/pt not_active IP Right Cessation
- 1986-08-05 FI FI863194A patent/FI85726C/fi not_active IP Right Cessation

Also Published As

Publication number	Publication date
DE3674859D1 (de)	1990-11-15
YU136986A (en)	1987-10-31
JPS6297992A (ja)	1987-05-07
NO168490B (no)	1991-11-18
NO863133L (no)	1987-02-06
EP0212329B1 (de)	1990-10-10
FI85726B (fi)	1992-02-14
FI85726C (fi)	1992-05-25
ATE57400T1 (de)	1990-10-15
PT83118B (pt)	1988-10-14
FI863194L (fi)	1987-02-06
YU45351B (en)	1992-05-28
ES2000385A6 (es)	1988-02-16
NZ217002A (en)	1988-11-29
AU6054486A (en)	1987-02-12
PT83118A (fr)	1986-09-01
JPH0742670B2 (ja)	1995-05-10
FI863194A0 (fi)	1986-08-05
AU591509B2 (en)	1989-12-07
NO863133D0 (no)	1986-08-04
EP0212329A1 (de)	1987-03-04
NO168490C (no)	1992-02-26
BR8603672A (pt)	1987-03-10

Legal Events

Date	Code	Title	Description
2002-12-09	MKLA	Lapsed

Publication	Publication Date	Title
BE1006057A3 (fr)	1994-05-03	Procede pour la delignification d'une pate a papier chimique.
EP0019963B1 (de)	1982-12-15	Verfahren zur Delignifizierung und zum Bleichen von chemischen und halbchemischen Zellstoffen
US5074960A (en)	1991-12-24	Lignin removal method using ozone and acetic acid
EP2761081B1 (de)	2018-08-08	Enzymatische vorbehandlung von holz in einem verfahren zur herstellung von mechanischem papierzellstoff
EP0578304B1 (de)	1996-09-18	Verfahren zum Bleichen eines chemischen Zellstoffs
US20150122429A1 (en)	2015-05-07	Method for producing pulp having low lignin content from lignocellulosic material
EP0165867A1 (de)	1985-12-27	Verfahren zum Bleichen von mechanischer Pulpe mittels Wasserstoffperoxid
US4826567A (en)	1989-05-02	Process for the delignification of cellulosic substances by pretreating with a complexing agent followed by hydrogen peroxide
EP0578303B1 (de)	1996-01-10	Verfahren zur Delignifizierung von chemischen Zellstoffen
EP0509905A1 (de)	1992-10-21	Verfahren zur Herstellung von gebleichtem Hochausbeutepapierzellstoff
CA1311093C (fr)	1992-12-08	Procede pour la delignification de matieres cellulosiques
US20110073264A1 (en)	2011-03-31	Kraft-Pulping of Hot Water Extracted Woodchips
EP0801169B1 (de)	2001-06-20	Verfahren zur Entfernung von Lignin aus Chemie-Papierzellstoffen und zur Bleichung dieser Zellstoffe.
EP0213376B1 (de)	1990-10-10	Verfahren zur Delignifizierung von Zellulosematerialien
SE413785B (sv)	1980-06-23	Forfarande for uppslutning av lignocellulosahaltiga material genom alkalisk kokning i nervaro av ett tillsatsemne av redoxtyp
EP0587822B1 (de)	1995-08-30	Verfahren zum bleichen und zur delignifizierung von chemischen papierzellstoffen
WO1994020674A1 (fr)	1994-09-15	Procede pour la delignification d'une pate a papier chimique
EP0726979B1 (de)	1998-05-13	Verfahren zum bleichen von zellstoff
EP0728238B2 (de)	2004-08-11	Verfahren zum bleichen von zellstoff
BE1005800A3 (fr)	1994-02-01	Procede pour la delignification et le blanchiment d'une pate a papier chimique.
BE656601A (de)	1964-12-31
CZ297592A3 (en)	1993-07-14	Method of improving lignin splitting selectivity of a paper pulp